Method of enameling ware



KROADHOUSE. METHOD OF ENAMELING WARE.

APPLlCATl0N Fll-ED MAR. 9. 1921.

1,395,732 I Patented Nov. 1, 1921.

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R BOADHOUSE METHOD OF ENAMELINQ WARE- Amlcmon. rum MAB-'9, H321 1,395,732. Patented Nov. 1, 1921.

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APPLICATION FILED MAR-9,192I.

V Patented Nov. 1, 1921.

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ROBERT ROADHOUSE, F DES PLAINES, ILLINOIS, ASSIGNOR OF ONE-HALF-TO THOMAS E. MCCAIG, OF CHICAGO, ILLINOIS.

METHOD OF EN AMELING WARE.

To all whom it may concern Be it known that I, ROBERT ROADHOUSE, a citizen of the United States, residing at Des Plaines, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Methods of Enameling WVare, of which the following is a specification.

This invention relates to a method of enameling ware and t0 furnaces for practising the same.

The primary object of this invention is to provide a furnace for enameling and the like having a main enameling chamber which is heated directly by fuel instead of by the indirect method used in the well known muffle type of furnacef This object canv be accomplished by this inventihn which consists in a furnace having a main enameling chamber which is heated directly by burning fuel therein and which has means for scavenging the gases of combustion before the objects to be enameled are introduced therein, so that the enamel will not be injured thereby.

Referring now to the drawings, F igure 1 is a rear elevation of the furnace;

Fig. 2 is a side elevation of the same; Fig. 3 is a vertical longitudinal section on the brokenline 33 of Fig. l;

Fig. 4 is a vertical transverse sectionon the line 44 of Fig. 3; and

Fig. 5 is a horizontal section on the broken line 5-5 of Figs. 2 and 3.

The furnace consists of" achamber formed by the side walls 11, the bottom 12 and the arch top 13. It is closed at the rear by the rear wall 14, except for the firing opening 15 and at the front by the front wall 16 and the sliding door 17 A flue 18 feeds from the rear of the furnace as shown in Figs. 3 and 4 and connects with a stack (not shown). This flue may be closed as will later be explained by means of the valve 19. Theside walls are reinforced in the usual manner by means of buck stays 20 and rods 21. y

The front door 17 is slidable up and down in suitable guide-ways 22 and is raised. by means of a rope 23 passing over suitable pulleys 24. This rope is connected to the .piston rod 25 which is attached to a piston 26 which is operable in the cylinder 27. Steam or air is introduced into this cylinder through pipes 28 and 29 from any suitable Specification of Letters Patent.

Patented Nov. 1, 1921.

Application filed March 9, 1921. Serial No. 450,862. I

source of supply. A counter-weight 30 is attached to the lower end of the piston-rod v 25 for counter-balancing the door 17. The lower part of the furnace is divided into two compartments 31 and 32 by means of the wall 33 which is preferably raised to is likewise introduced through the pipe 37,

and the pressures of both the oil and the air at the burner are regulated by suitable valves. Preheating coils .38 and 39 are located in the walls of the furnace for heat ing the oil and air respectively before they are fed to the furnace. Quick opening valves 40 and 41 are placed in the oil and air linewhic h have operating levers 42 and 43 respectivelv which are connected by means of rods 44 and 45 with levers 46 which are secured to the shaft 47.

- This shaft is journaled. in suitable bear ings at the rear of the furnace and carries a lever arm 48 which is operable by the rod 49, the lever 50 and the rod 51 from the front of the furnace.

It will be seen from the foregoing that the valves 40 and 41 may be opened and closed simultaneously from the front of the 41 are opened the doors 52 will be raised.

uncovering the openings 15. In the same way the flue valve 19 as shown in Fig. 2 is connected to the lever 50 by means of a rope 55 passing over pulleys 56 and the crank arm 57. This arm also carries a weight 58 for counter-weighing the doors 19 and 52.

The operation of the device is as follows: Starting with the parts in the positions shown in Fig. 3, the burners 35 operating under compressed air are forcing a powerful flame over the ignition blocks 59 and along the walls of the compartments 31 and 32.. The hot gases are deflected upwardly and backwardly by the end wall 16 and passed back through the top of the furnace chamber and out through the flue 18.

As soon as the desired temperature is reached the rod 51 is pushedto the right as shown in Fig. 2, shutting off the burners 35 and dropping the doors 19 and 52,.tlrereby closing the openings and the flue 18. The

door 17 is then raised to permit of the furs. nace being charged and cold air rushing in through the bottom of the opening, forces out the burned gases through the top' of the opening, thereby scavenging the enameling chamber. The material to be enameled has previously been placed upon ,crates or' frames and'these are brought in on the track 60 and are introduced through the front opening and deposited upon the ledges 34 and the top of thecentral wall 33. The door '17 is then closed and the crates are left withinthe furnace the desired length of time to bake the enamel.

The door 17 is then raised and the crates removed and the door 17 again lowered. The rod 51 is again pulled to the left to the full line position shown in Fig. 2, openingthe doors 19 and 52, and valves 40 and 41, thereby throwing. a combustible mixture from eachof the burners 35 against the ignition blo ks 59. These retain a great deal of the ieat which they previously had without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as ossible in view of the prior art.

What I- c aim as new and desire to secure by Letters Patent is:

1. Ina furnace for enameling and the like, a chamber, means for producing combustion therein, control means for stopping said combustion, means for scavenging the prodnets of combustion and cans for closing the a chamber, means for producing combustion therein, control means for stopping said combustion, and a. door opening to admit air to said chamber for scavenging the same when the furnace is being charged with ware to 'be burned and closing to seal said chamher during the baking operation.

3. In a furnace for enameling and the like, a chamber, means for producing combustion therein, control means for stopping said combustion, and a door near the top of said chamber opening to admit air to said chamher for scavenging the same when the furnace is being chargedwith ware to be burned and closing to seal said chamber during the baking operation.

' 4. In a furnace for enameling and the like, a chamber having an opening, a burner for producing combustion therein, control means for starting and stopping said com: bustion, a flue, doors operably connected to said control means'and movable as combustion in the burner is stopped, to close said flue'and opening, andmeans for scaven ing said chamber of the products of com ustion. v

5. The method of enameling ware consisting of producing combustion directly in the namellng chamber, scavenging ,the products of combustion and introducing the on jects to be enameled into said chamber.

6. The method of enameling ware consisting of producing combustion directly in the enameling chamber, scavenging.- the products of. combustion, introducing the ob.- jects to be enameled into said chamber and closing said chamber.

ROBERT ROADHOUSE. 

